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Social Security Contribution Calculator
Enter an employee's monthly wage and the system calculates the employee and employer contributions, using the rates and minimum–maximum wage base of the selected year, which the administrator records together with the source reference and verification status.
Monthly contribution (Section 33)
0.00 THB
Deducted from the employee each month
Each side's contribution is rounded to whole baht: 50 satang or more rounds up, less than 50 satang rounds down. The employer must remit both shares with Form SPS 1-10 by the 15th of the following month.
How to use
- Select the year to calculate (rates and wage ceilings may change from year to year)
- Enter the monthly wage used to calculate the contribution
- View the wage base actually used, the employee contribution, the employer contribution, and the total per month/per year
- Check the note on the rate data status before using the figures to file SSO 1-10
Frequently asked questions
How is the Section 33 Social Security contribution calculated?
Multiply the monthly wage by the contribution rate (normally 5% each side). The wage used must not be below the minimum base or above the ceiling set by law for that year. For example, on a wage of 10,000 baht, 500 baht is deducted from the employee and the employer contributes another 500 baht.
When does the Social Security wage ceiling change?
The maximum wage base used to be 15,000 baht (maximum contribution 750 baht), and an announcement has set the ceiling to rise in steps starting from 2026. This tool stores rates by year and shows the verification status of each value. Please confirm against the Social Security Office announcement before real use.
How are contributions rounded?
If the calculated contribution has a fraction of 50 satang or more, round up to 1 baht; if less than 50 satang, drop it. For example, a wage of 10,010 baht × 5% = 500.50 baht, rounded to 501 baht.
What is included in the wage used for the calculation?
Generally it is the wage paid as compensation for work during normal working hours. Other items, such as overtime, bonuses or certain welfare benefits, may not count as wages for contribution purposes. Check the details with the Social Security Office.
Can the contributions paid be used as a tax deduction?
Yes. The contribution the employee actually paid can be deducted from personal income tax. Try our income tax calculator to see the overall result.